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Finding the Fourth Proportional to 315.56, 435.20 and 205.00

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Solution

The fourth proportional to 315.56, 435.20 and 205.00 is: 282.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.56 : 435.20 = 205.00 : x
  2. Step 2: Convert to fraction form
    315.56/435.20 = 205.00/x
  3. Step 3: Cross multiply
    315.56x = 435.20 × 205.00
  4. Step 4: Simplify right side
    315.56x = 89,213.89
  5. Step 5: Solve for x
    x = 89,213.89/315.56
  6. Step 6: Final answer
    x = 282.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.